Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.31: Poster
Thursday, March 19, 2020, 15:00–18:00, P3
57Fe Mössbauer spectroscopy on FePcF16 and its µ-Oxo dimer in catalysis reaction — •Felix Seewald1, Florian Puls2, Hans-Joachim Knölker2, and Hans-Henning Klauss1 — 1Institute of Solid State and Materials Physics, TU Dresden, D-01069, Germany — 2Department Chemie, Technische Universität Dresden, Bergstraße 66, D-01069 Dresden, Germany
Iron-hexadecafluorophthalocyanine (FePcF16) is used as a oxidation catalyst. Understanding its catalysis mechanism is part of current research.
Both FePcF16 and its mu-Oxo dimer ([FePcF16]2O) are already identified as steps of the oxidation cycle.
The Mössbauer spectra of [FePcF16]2O can be described by two sites at room temperature, both exhibiting quadrupole splitting. A temperature dependent reversible transition between both sites can be observed. Below 30 K the onset of a magnetic hyperfine field is observed obtaining a value of BHyp = 48.77(12) T at 4.2 K.
The FePcF16 spectra show one additional third site with a considerable quadrupole splitting and an electric field gradient largest principle component of Vzz = 154(2) V/Å2. This site stays paramagnetic down to 4.2 K.
First measurements of the frozen reaction solution unveil an additional fourth site in an characteristic Fe(II) charge and high spin (S=2) state. We will discuss the implications of these findings on the catalysis process.